It is remarkable that a series of events taking place over the past 3 months produced a unified message about hydroxychloroquine, and produced similar policies about the drug in the US, Canada, Australia, NZ and western Europe. The message is that generic, inexpensive hydroxychloroquine is dangerous and should not be used to treat a potentially fatal disease, Covid-19, for which there are no (other) reliable treatments.
Hydroxychloroquine has been used safely for 65 years in many millions of patients. And so the message was crafted that the drug is safe for its other uses, but dangerous when used for Covid-19. It doesn’t make sense, but it seems to have worked.
Many more excellent points in that article.